<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入要评论的内容(最多吐槽120字)" maxlength="120" v-model="msg"></textarea>

        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>
        <div class="cmt-list">
            <div class="cmt-item" v-for="(item,i) in comments" :key="item.add_time">
                <div class="cmt-title">
                    第{{i+1}}楼&nbsp;&nbsp;用户:{{item.user_name}}&nbsp;&nbsp;发表时间:{{item.add_time | dateFormat}}
                </div>
                <div class="cmt-body">
                    {{item.content === 'undefined'? 'aaa':item.content}}
                </div>
            </div>
        </div>

        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>

<script>
    export default {
        data(){
            return{
                pageIndex:1,//默认展示第一页数据
                comments:[], //所有的评论数据
                msg:''//评论输入的内容
            }
        },
        created(){
            this.getComments();
        },
        methods:{
            getComments(){
                this.$http.get('api/getcomments/"+this.id+"?pageindex="+' +
                    'this.pageIndex+"').then(result => {
                    if(result.body.status === 0){
                        //每当获取新评论数据的时候，不要把老数据清空覆盖，而是应该以老数据拼接上新数据
                      this.comments = this.comments.concat(result.body.message)
                    }else{
                        Toast('获取评论失败')
                    }
                })
            },
            getMore(){
                //加载更多
                this.pageIndex++;
                this.getComments();
            },
            postComment(){
                //发表评论
                //校验是否为空
                if(this.msg.trim().length === 0){
                    return Toast("评论内容不能为空")
                }
                this.$http.post('api/postcomment/'+this.$route.params.id,{content:this.msg.trim()}).then(function (result) {
                    if(result.body.status === 0){
                        //1、拼接出一个评论对象
                        var cmt = {user_name:'匿名用户',add_time:Date.now(),content:this.msg.trim()};
                        this.comments.unshift(cmt);
                        this.msg = "";
                    }
                })
            }
        },
        props:["id"]
    }
</script>

<style lang="scss" scoped>
.cmt-container{
    h3{
        font-size:18px;
    }
    textarea{
        font-size:14px;
        height: 85px;
        margin: 0;
    }
    .cmt-list{
        margin: 10px 0;
        .cmt-item{
            font-size:13px;
            .cmt-title{
                line-height: 30px;
                background-color: #ccc;
            }
            .cmt-body{
                line-height: 35px;
                text-indent:2em;
            }
        }
    }
}
</style>